Mod. 3 Flashcards
(16 cards)
Law of conservation of mass
matt. can’t be created or destroyed but can change forms
Law of constant composition
a pure compound will always have the same elements in the same amount of mass.
Thompson’s atomic model
electrons spread evenly through atom
Rutherford’s atomic model
electron’s orbiting nucleus
who discovered the nuetron?
James Chadwick
Who made the Bohr model?
Bohr
Who is the father of modern atomic model
John Dalton
Who first came up with the idea of atoms?
Democritus
Who made the Quantum Mechanical model?
Shrodinger
What is the atomic numb.?
numb of protons in an atom
What is the atomic mass numb?
numb of protons plus numb of neutrons in atom
isotopes?
atoms of same element with diff numb of neutrons
electron cloud?
likely place for electrons to be around the nucleus
Who first developed a method for organizing elements?
Mendeleev
valence electrons
electrons in outermost energy level of atom
What is noble status?
when the atom has 8 electrons in its outermost energy level
